Thermometer.



F. F. ZUCKSCHWERDT.

THERMOMETER.

APPLIUATION FILED SEPT.14,1911.

Patented June 23, 1914,

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@HH/oma@ UNITED STATES' PATENT orrrcE.

FRITZ F. ZUCKSCHWERD-T, QF ILMENLU, GERHANY: ASSIGNOB T0 LINUS B.KAUIFMAN, OF COLUMBUS, QHIO.

THERMOMETER.

Specication of Letters Patent.

Patented J une 23, i914 To all 'whom it 'm/afe/ ooneem.'

Be it known that I, Fam F. Zoom scHwERDT, a subject of the Emperor ofGermany, residing at Ilmenau, Thuringia, Germany, have invented certainnew and useful Improvements in Thermomeb's, of which the following is aspecioation, referencc being had therein to 'the accempanying drawings.

My invention relates to thermometers.

The object of my invention is to strengthen and protect the thermometertube and scale and to make the same antiseptic and sanitary. This Iaccomplish by employing a cover or casing to seal the scale from contactwith foreign matter.

A further object is to provide an improved scale. The scale may beetched upon the surface of the tube and coated or filled with a coloringmatter to more clearly define the same; but I have devised andpreferally employ a scale printed upon a sheet of transparent materialsuch as gelatin. It may be printed in any color but I preferably employblack; and I preferably form a strip of enamel preferably white, on theopposite side of the tube or casing to the scale to form a back-groundfor same so that it may be more easily read. 4

With these and other objects in view my invention consists of theconstructions and combinations hereinafter described and set forth intheclaims.

In the accompanying drawings Figure 1 represents a thermometer embodyingmy invention. Fig. `2 is a longitudinal section of same. Fig. 3represents a casing fused or welded together at one end ready to slipover the thermometer tube and be Welded at its other end to the tube.Fig. 4 represents a strip of transparent material having a scalethereon. Fig. 5 is a longitudinal section of the tube without the scaleand casing and Figs. 6, 7 and 8 represent differ` ent forms of the tubeand casing in crosssection, Figs. 6 and 7 showing the tube anular orlens-shaped with the casing conforming to same in Fig. 6 and cylindricalin Fig. 7 and Fig. 8 shows the tube round with the casing cylindrical toconform to same.

Like numerals represent the same parts in the several views.

In the drawings l represents a thermometer tube having a bulb 2 and bore3 for the expanding substance. A scale may be etched upm me outersurface of the mbe and fled or mated with a coter-ing matter; but Ipreferably print the scale 4 upon a `separabe street of mnspare'ntsubstance 5 such as gelatin and secure the same to the mbe. This may be`done in any suitable way as by a (over ef tine necessary dimensions; but

I preferably provide a casing 6, the interior of which I bly conform tothe este rior of the tube although it may be of any suitable form. Ipreferably employ gelatin or like substance for the scale sheet, as itis not only transparent but can be readily bent to its position betweenthe tube and casing; and I preferably make the/ tube and casing of glassas that material is fusible and can be easily welded.

The casing may be of sufficient length to entirely inclose the tube andthe ends of the casing fused or welded to hold the tube within thecasing; but I preferably employ a casing closed at one end 7 and fusedor welded to the tube at the other end 8 as shown. This fusing orwelding of the cover or casing seals the scale from Contact with foreignmatter, avoids the possibility of disease germs finding lodgment in thescale to be carried from one person to another when the thermometer-isused to take the temperature of the body; and further prevents thedestruction of the scale by coming in contact with chemicals or otherdisintegrating matter. I preferably provide a strip of enamel asabackolnd to more clearly define the scale an I have shown the same at10 as being formed in the tube. Further I preferably form the tubeangular or lens-shaped in crosection as articularly shown in Figs. 6 and7 so that t e scale can be more easily read; and I preferably form theinterior of the casing to conform to the tube; but the casing may be ofany suitable shape, it being shown cylindrical in Figs. 7 and 8; and 1nFig. 8 the tube is shown round to conform with the cylinder.

Having thus described my invention I claim:

1. In a thermometer, a tube having a bore for the expanding substance, acover or casing, and a sheet of exible transparent material having ascale interposed between said tube and cover or casing, said cover orcasing being sealed or Welded to said tube, substantially as described.

2. In a thermometer, a tube having a bore for the expandin substance, a`cover or casing, a sheet of exible transparent material having a scalethereon interposed between said tube and cover or casing and a strip ofenamel opposite said scale, said cover or casin being sealed to protectsaid scale, substantially as described.

3. In a thermometer, a glass tube havin a bulb and bore for theexpanding materia a fglass cover or casing for said tube, a sheet ogelatin having a scale thereon interposed between said tube and cover orcasing, said sheet being flexible to bend and conform to the shape ofsaid tube and said cover or casing being sealed at its respective4 ends,substantially as described.

4. In a' thermometer, a glass tube having a bulb and bore for theexpanding substance, a glass cover or casing, a sheet of elatin having ascale rinted thereon and interposed between sai tube and cover orcasing, an enamel strip opposite said Scale, said sheet being flexibleto conform to its position between said tube and cover or casc lng andsaid cover or casing being fused or welded at its respective ends,substantially as described.

In testimony whereof I have hereunto affixed my signature in thepresence of two 3o witnesses. A

FRITZ F. ZUCKSCHWERDT. Witnesses:

CARL N. LOREY, Dr; ADAM S'ro'rr.

